Crucial.com now offers 24GB kits of DDR3-1333 RDIMM server memory.
You now have easy access to three-channel, 8GB DDR3-1333 RDIMM
modules by going to http://www.crucial.com/servers .

These 24GB memory kits were specifically designed for high-density,
high-bandwidth server applications, such as virtualization,
high-performance computing, or database servers. Additionally,
utilizing 8GB DDR3-1333MHz modules is the only way for dual CPU
servers to reach 48GB of installed memory while still reaching the
maximum bandwidth the server is capable of achieving, according to
the folks at Crucial.